What is the overall goal? It should be to hold a valid strata committee meeting. If the owners and SC members are getting hung up on the period of notice, then give everyone more notice. The 3-days notice is the minimum. Why not set the date for the next strata committee meeting at each meeting – say in 2 months time, and state the agenda is to get sent between 14 and 7 days beforehand? Then everyone is satisfied, and the meeting is clearly allowed.
The easiest solution to the current notice period kerfuffle is to reschedule the meeting for a week or two later.